Strong storms are possible from midday into this evening for Allegan and Ottawa counties.

The storms are forecast to move out of Wisconsin and Illinois this afternoon and evening and sweep into West Michigan with damaging winds more than 70 mph and isolated severe storms with large hail, according to the National Weather Service in Grand Rapids. A few tornadoes are even possible and heavy rains could lead to flash flooding.

The chance of severe weather increases south of I-96, with the highest threat toward the Michigan-Indiana line.

“This isn’t a slam dunk by any means but the highest threat for strong/severe storms will be south of a Muskegon-to-Lansing line,” weather service officials wrote on the organization’s web page.

Storms could come in the form of a derecho — a widespread, long-lived wind storm within a band of rapidly moving showers or thunderstorms that can produce wind damage over a large swath of land, according to AccuWeather.com.

“While wind gusts from derechos can sometimes reach speeds over 80 or even 100 mph, the vast majority of observed wind reports are usually between 60 and 70 mph,” said AccuWeather.com meteorologist Anthony Sagliani. “Additionally, these kinds of wind speeds can cause minor damage to structures, including roofs on houses, and they can easily blow around any unsecured objects left outside.”

This storm system can bring potentially flooding rain.

“Rain of this magnitude, on top of already saturated soil, will cause flash flooding and the possibility of renewed flooding or larger waterways,” Sagliani said.

Holland’s rain record for June 12 is 1.48 inches in 2000. Holland is 0.20 inch below the normal month-to-date of 1.25 inches for May.

Today’s high will be about 79 degrees with a low of 59 degrees tonight.

After the storms, Thursday will be breezy and clear with a high about 71 degrees. Skies remain clear through Sunday, though there is a 40 percent chance of rain Saturday night.

A dense fog advisory has been extended to 3 p.m. today for Lake Michigan from 5 nautical miles to midlake. Visibility will be less than a quarter-mile at times, according to the weather service.